In a sample of 100 steel wires the average breaking strength is 50 kN, with a standard
Question:
a. Find a 95% confidence interval for the mean breaking strength of this type of wire.
b. Find a 99% confidence interval for the mean breaking strength of this type of wire.
c. An engineer claims that the mean breaking strength is between 49.7 kN and 50.3 kN. With what level of confidence can this statement be made?
d. How many wires must be sampled so that a 95% confidence interval specifies the mean breaking strength to within ± 0.3 kN?
e. How many wires must be sampled so that a 99% confidence interval specifies the mean breaking strength to within ± 0.3 kN?
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a X 50 s 2 n 100 z 025 196 The confidence interval is 50 1962100 or 49608 50392 b X 50 s 2 ...View the full answer
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